engineering recuitment ICAR Technician 2021 Mock Test (Re-Exam) General Science Chemistry Periodic Table

बल्ब फिलामेंट बनवण्यासाठी कोणता धातू वापरला जातो?

1
तांबे
2
टंगस्टन
3
सिलिकॉन
4
लोह 
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